Lock-nut.



A. H. DEVLYN.

LOCK NUT.

APPLICATION FILED MAY 29. I91].

1 2165 437., Patented May 7 ,1918.

ARTHUR HENRY DEVLYN, 0F TRUNDLE, NEW SOUTH WALES, AUSTRALIA.

LOCK-NUT.

Specification of Letters latent.

Patented May "2, 1918.

Application filed May 29, 1917. Serial No. 171,680.

To all whom it may concern:

Be 1t known that I, ARTHUR HENRY DEV- LYN, a subject of the King of Great Britain and Ireland, etcJ, residing at Trundle, in the- State of New South Wales, Commonwealth of Australia, have invented certain new and useful Improvements in Lock-Nuts; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a locking nut which when fitted on a bolt will not unscrew by reason of vibration, or ordinary causes of accidental loosening, but if an attendant wishes to remove or retract it he can do so.

To contain this invention a nut is modified by providing in it a recess opening into the tapped screw thread, and acting as a chamber for a springy dog or fin which is fixed so that part of the fin projects (when no bolt is present) beyond the screw thread surface into the space to be occupied by the bolt. When the nut is being screwed on, the fin is slightly deflected by the bolt so allowing the latter the necessary room in the nut hole.

The fin may be of various sizes and shapes, as chisel edged, and may be adjustably or otherwise set in position. It projects at such an angle that it will not prevent easy screwing on of the nut, and during the said screwing an edge of the fin will have frictional contact with the bolt thread.

If unscrewing of the nut be attempted the bolt will tend to deflect or bend the fin in a direction more nearly diametrical to the bolt in which direction the fin will not however become deflected. ()n the contrary, the fin edge will tend to dig into the bolt, and thus prevents rotation of the nut.

To remove the nut the fin is deflected by an attendant-until its edge is clear of the bolt, the direction of the deflection being that which makes the fin more nearly tangential to the bolt than it was,the fin chamber having room for this.

The desired deflection can be produced by actuating any suitable releasing pin, key, or screw to press the fin, for which purpose the fin chamber is suitably shaped, as by having a key or screw hole in the nut. To keep out dirt, grease can be used in the fin chamber or some other protective means may be adopted.

In the accompanying drawings Figure 1 is a plan of my nut, the fin being in normal position in firm lines, and in deflected position (to allow removal or slackening of the nut) in dotted lines. Fig. 2 shows in vertical sectionpart of a flanged cap nut, modified relatively to Fig. 1. Fig. 3 is a vertical section of part of the nut in Fig. 1.

Fig. t shows parts of a fin. Fig. 5 is a plan of the parts in Fig. 2. Fig. 6 is a plan from beneath of the parts in Fig. 3.

In these drawings a indicates a nut body, with faces or ends 6, c, and screw thread (Z, a is a flange.

I make, at any suitable part of body a, a chamber 6, and insert a fin f in it.

A chisel edge 7, at the fin front is preferred.

The rear 6 of the chamber 6 may be just large enough to receive the rear f of the fin and hold it firmly but any method of securing firmness is usable. Part of the chamber is wide as in Fig. 1, so that there is room in it for the deflection of the forward end of the fin in a direction away from the thread ol.

In Fig. 1, f shows the deflected position.

A part or extension of recess 6 is provided at g (and it may be continued as at g to form a hole through the nut) to allow of the insertion of a deflector which may be a common nail, which is at will removable, its purpose being to (when required) deflect the fin. The hole will in some cases contain a fin deflector ready for use, as, in Fig. 2, a pin i which at its end near the fin is tapered so that it can pass alongside the fin easily. Deflector 2' may be wholly (or as in Fig. 2 partly) screw threaded, and

it engages a thread 9 which is tapped.

along all (or as in Fig. 2 part) of the depth of the hole. When the deflector is in the nut, ready to be screwed down or moved to engage the fin, it also keeps the hole protected from fouling. Any suitable screw or like deflector is usable, the advantage of a deflector tapered as at i being that fin deflection and release will be gradual and regulatable. A deflector could be inserted either at face 6 or face 0 when the hole passes through the nut. The direction of the hole could be varied; for example it could extend at right angles to the fiat (or side) of the fin. Whether its fin is or is not deflected the nut can be screwed on a bolt as per arrows in Figs. 1 and 5; but it cannot screw off unless the fin is deflected, as illustrated at F. My nut works as a common nut ifthe deflector (before the nut is screwed on) is so located that the fin edge does not project into the bolt space; after the nut is screwed on the deflector can be adjusted or moved to let the fin lock the bolt.

Proportions, designs, and numbers of parts, and minor details of the construction, may be varied while retaining matter hereinafter claimed Having described my invention what I claim is new and desire to secure Letters Patent for is:-

A lock-nut comprising a nut having a screw-threaded bore and a laterally extending recess disposed-outwardly of and leading into one side of said bore, said recess having a reduced outer extension, said nut having a longitudinal screw-threaded "opening disposed outwardly of and near "the bore of the nut and leading into said recess atone side thereof at .a point inwardly of and spaced from "the outer end wall of said recess; a fin having its inner portion ararranged within the longitudinal screwthreaded opening and having one end tapered to contact with the "side of "the fin at apoint spaced from said end wall of the recess to bend the fin upon such end wall and thereby retain the same against accidental displacement and shift "the same to the inactive position.

In testimony whereof I a'irlX my signature in the presence of two Witnesses.

ARTHUR HENRY DEVLYN. Witnesses:

PERCY H NT, MARY LoUIsn GREEN.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of'iPaztents.

Washington, I). 0'. 4 

